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Thread started 29 May 2014 (Thursday) 23:58
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Problems with SIgma 50mm 1.4 ART

 
Dlee13
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May 30, 2014 07:51 |  #16

Have you tried AFMA or using the Sigma Dock? I've read about several people on different forums having focus issues and one solution was to calibrate it with the dock only. When one person calibrated it with the dock and also used AFMA they still had issues although once they set it back to 0 and used the dock only, it solved their issues.


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snake0ape
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May 30, 2014 08:27 as a reply to  @ Dlee13's post |  #17

When you focused with the outer points, does it give you the same results with all the outer points, ie left and right sides?

I just got my lens a few days ago. I seemed to have a pretty good one. With +0 MA it is sharp and AF is consistent with all focus points on my 5diii, all outer and center.

Then I tried calibration with the dock. I observed it was a tad sharper with a +1 calibration at MDF and 2.2 ft. The 3rd and infinity point was perfect at +0. (Ma at 1,1,0,0)

Well this caused my lens / 5diii combo to go nuts with AF. Between MDF and around 2.2 feet, it mis-focused thinking it was 8ft away rather than two feet away. However, the mis--focus was consistent.

So by trial and error, I found best that I set the four MA points to 0,1,0,0. Now I get sharp and consistent focus through all distances and no issues thus far. I'm pretty happy with this lens. The +1 at MDF is slightly better, but is pretty anal. (It's in between 0 and 1) The +1 at 2.2 feet is noticeable at pixel peeping. When sigma upgrade the firmware, I'll try 1,1,0,0 again.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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Jerobean
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May 30, 2014 09:23 as a reply to  @ snake0ape's post |  #18

Sorry to hear Snake, I know you were eagerly awaiting this lens.

I hope you are able to figure out the issues.

not sure if you have the dock, but this is a great article about it.

http://www.lensrentals​.com …mization-pro-and-usb-dock (external link)


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Sirrith
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May 30, 2014 09:39 |  #19

Its a 5DIII problem, not a 50A problem. Mine does it sometimes too. It's quite annoying.


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Patman99
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May 30, 2014 10:23 |  #20

For my Sigma lenses, I typically turn off my focus points that aren't cross-type, so I end up with 41 AF points, not 61 AF points. Maybe use only the cross-type AF points?




  
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Invertalon
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May 30, 2014 10:29 |  #21

I had this happen with a 35L once I got used... Center point perfect but both left and right outer AF points front focus a ton.

Eventually, I bought a new one and no issues. My guess is some type of decentering that messes with the AF, even if you don't see any signs of it when reviewing pics. Just my guess!

I would exchange personally.


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Thestructured
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May 30, 2014 10:37 as a reply to  @ Invertalon's post |  #22

I am still out of town but I'll be home tonight. I actually found the tests I did with the 6d and this lens and the outer points seemed to work fine...

So maybe it's a 5d iii issue...which is weird because it does not exist with other lenses as far as I know.

ANNOYING. I have two weddings this weekend and will just cope with center point only I guess..and figure out what to do next week.

And for whoever asked if it's all the outer points..yes. And I do have only cross type enabled though I did test the non cross type points. The entire center cluster works correctly (as in ..the entire 21 point vertical center column).


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snake0ape
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May 30, 2014 11:20 |  #23

Jerobean wrote in post #16940119 (external link)
Sorry to hear Snake, I know you were eagerly awaiting this lens.

I hope you are able to figure out the issues.

not sure if you have the dock, but this is a great article about it.

http://www.lensrentals​.com …mization-pro-and-usb-dock (external link)

Hello Jerobean,

I happy with my lens. It has no issues right now. My point before is that when I calibrated my lens with the dock with data 1,1,0,0 (a small change) the 5diii gave me crazy mis-focusing. When I changed the data set to 0,1,0,0 all became fine. There must be a bug in the firmware that needs to be fixed.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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Talley
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May 30, 2014 11:53 |  #24

Thestructured wrote in post #16939642 (external link)
This article seems to hint that It may be a 5d iii issue, as a few people experience this exact problem with the 5d iii and 50L. http://www.dpreview.co​m/forums/thread/349626​4?page=1 (external link)

I have this problem with my 24-70.... refuses to be in focus in outer points with my 24-70. the 35 and the 135 and 120-300 is fine. my 85 sometimes will do this on outer points as well.

at first I thought it was my Tamron having issues but it was rock solid on 6D.

I think it is a 5D3 issue.


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Charlie
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May 30, 2014 12:11 |  #25

I'de say to send it to sigma instead. That way, you wont have to deal with the preorder stuff and should get it back in 2 weeks time.


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gnome ­ chompski
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May 30, 2014 12:24 |  #26

i cant quantify this statement with anything other than my observation, but I noticed that the majority of those who were complaining of the Sigma 35 af were using 5dmk3's. I thought something was fishy then...


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Charlie
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May 30, 2014 12:30 |  #27

gnome chompski wrote in post #16940521 (external link)
i cant quantify this statement with anything other than my observation, but I noticed that the majority of those who were complaining of the Sigma 35 af were using 5dmk3's. I thought something was fishy then...

when you've got a 5D3, you've got really high expectations ;)

outer cross types have been finnicky depending on lenses.


Sony A7riii/A9 - FE 12-24/4 - FE 24-240 - SY 24/2.8 - FE 28/2 - FE 35/2.8 - FE 50/1.8 - FE 85/1.8 - EF 135/1.8 Art - F 600/5.6 - CZ 100-300 - Astro Rok 14/2.8 - Tamron 17-28/2.8 - 28-75/2.8 RXD, 70-200/2.8 VC

  
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snake0ape
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May 30, 2014 13:33 |  #28

Charlie wrote in post #16940530 (external link)
when you've got a 5D3, you've got really high expectations ;)

outer cross types have been finnicky depending on lenses.

I have both the sig 35 and 50 paired with my 5Diii.
I have noticed that when using the dock calibrator, if you MA one of the points incorrectly, especially infinity, then you get alot more mis-focus problems. I had to adjust both my 35 and 50 more than once to get it to work well with my 5diii.
Currently, I have tinkered both 35 and 50 so that I feel very confident with its AF performance. I have no more AF issues with outer, center, low light, artificial light, sunlight situations. I didnt mind the tinkering. When you nail the focus, that extra sharpness is amazing and worth it.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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chubbyone
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May 30, 2014 20:50 |  #29

Sucks about your lens.


Anyways, I have that vacuum too and it's a beast! Keep the filters clean and she's happy. Been running for 5 years now. Oreck who? Shark what? Dyson schmyson.


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Thestructured
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May 30, 2014 22:38 as a reply to  @ chubbyone's post |  #30

You know, one thing I never thought about is that it's possible that some lenses are incompatible with some focus points, and you would never know it unless somebody told you..

It's rare but maybe when using certain lenses the outer cross points on the 5d iii are really only acting as single direction points. Hmm...


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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